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SEA · 2024 transactions
Data through 2026-10-03
| Date | Player | Type | Detail |
|---|---|---|---|
| Dec 19 | Nick Raposo | Claimed Off Waivers | Seattle Mariners claimed C Nick Raposo off waivers from Toronto Blue Jays. |
| Dec 10 | Jacob Nottingham | Signed as Free Agent | Seattle Mariners signed free agent C Jacob Nottingham to a minor league contract. |
| Dec 9 | Yunior Marte | Signed as Free Agent | Seattle Mariners signed free agent RHP Yunior Marte to a minor league contract. |
| Dec 8 | Yorlin Calderon | Signed as Free Agent | Seattle Mariners signed free agent RHP Yorlin Calderon to a minor league contract. |
| Dec 7 | Sauryn Lao | Signed as Free Agent | Seattle Mariners signed free agent 1B Sauryn Lao to a minor league contract. |
| Dec 5 | Drew Pomeranz | Signed as Free Agent | Seattle Mariners signed free agent LHP Drew Pomeranz to a minor league contract. |
| Dec 5 | Emerson Hancock | Number Change | RHP Emerson Hancock changed number to 26. |
| Dec 2 | Dauris Valdez | Signed as Free Agent | Seattle Mariners signed free agent RHP Dauris Valdez to a minor league contract. |
| Nov 22 | Austin Voth | Declared Free Agency | RHP Austin Voth elected free agency. |
| Nov 22 | Josh Rojas | Declared Free Agency | 3B Josh Rojas elected free agency. |
| Nov 22 | Sam Haggerty | Declared Free Agency | LF Sam Haggerty elected free agency. |
| Nov 22 | JT Chargois | Declared Free Agency | RHP JT Chargois elected free agency. |
| Nov 19 | JT Chargois | Designated for Assignment | Seattle Mariners designated RHP JT Chargois for assignment. |
| Nov 19 | Austin Shenton | Trade | Tampa Bay Rays traded 1B Austin Shenton to Seattle Mariners for cash. |
| Nov 18 | Adonis Medina | Signed as Free Agent | Seattle Mariners signed free agent RHP Adonis Medina to a minor league contract. |
| Nov 18 | Jesse Hahn | Signed as Free Agent | Seattle Mariners signed free agent RHP Jesse Hahn to a minor league contract. |
| Nov 15 | Casey Lawrence | Signed as Free Agent | Seattle Mariners signed free agent RHP Casey Lawrence to a minor league contract. |
| Nov 4 | Jorge Polanco | Declared Free Agency | 2B Jorge Polanco elected free agency. |
| Nov 4 | Jackson Kowar | Status Change | Seattle Mariners activated RHP Jackson Kowar from the 60-day injured list. |
| Nov 4 | Sam Haggerty | Status Change | Seattle Mariners activated LF Sam Haggerty from the 60-day injured list. |
| Nov 4 | Matt Brash | Status Change | Seattle Mariners activated RHP Matt Brash from the 60-day injured list. |
| Nov 4 | Blas Castaño | Selected | Seattle Mariners selected the contract of RHP Blas Castano from Tacoma Rainiers. |
| Oct 31 | Luis Urías | Declared Free Agency | 3B Luis Urías elected free agency. |
| Oct 31 | Yimi García | Declared Free Agency | RHP Yimi García elected free agency. |
| Oct 31 | Justin Turner | Declared Free Agency | 3B Justin Turner elected free agency. |
| Oct 15 | Nick Dunn | Signed as Free Agent | Seattle Mariners signed free agent 3B Nick Dunn to a minor league contract. |
| Oct 4 | Ty Cummings | Trade | Seattle Mariners traded RHP Ty Cummings to Tampa Bay Rays. Player to be named later (Randy Arozarena trade). |
| Oct 1 | Cody Bolton | Recalled | Seattle Mariners recalled RHP Cody Bolton from Tacoma Rainiers. |
| Oct 1 | Ryan Bliss | Recalled | Seattle Mariners recalled 2B Ryan Bliss from Tacoma Rainiers. |
| Oct 1 | Tyler Locklear | Recalled | Seattle Mariners recalled 1B Tyler Locklear from Tacoma Rainiers. |
| Oct 1 | Dominic Canzone | Recalled | Seattle Mariners recalled RF Dominic Canzone from Tacoma Rainiers. |
| Oct 1 | Jhonathan Díaz | Recalled | Seattle Mariners recalled LHP Jhonathan Díaz from ACL Mariners. |
| Oct 1 | Austin Kitchen | Recalled | Seattle Mariners recalled LHP Austin Kitchen from Tacoma Rainiers. |
| Oct 1 | Cade Marlowe | Recalled | Seattle Mariners recalled LF Cade Marlowe from Tacoma Rainiers. |
| Oct 1 | Samad Taylor | Recalled | Seattle Mariners recalled 2B Samad Taylor from Tacoma Rainiers. |
| Oct 1 | Carlos Vargas | Recalled | Seattle Mariners recalled RHP Carlos Vargas from Tacoma Rainiers. |
| Oct 1 | Bryce Miller | Status Change | Seattle Mariners activated RHP Bryce Miller from the 15-day injured list. |
| Oct 1 | Luis Castillo | Status Change | Seattle Mariners activated RHP Luis Castillo from the 15-day injured list. |
| Sep 28 | Bryce Miller | Status Change | Seattle Mariners placed RHP Bryce Miller on the 15-day injured list. Right index finger blister. |
| Sep 28 | Emerson Hancock | Recalled | Seattle Mariners recalled RHP Emerson Hancock from Tacoma Rainiers. |
| Sep 23 | Gregory Santos | Status Change | Seattle Mariners activated RHP Gregory Santos from the 15-day injured list. |
| Sep 23 | Jhonathan Díaz | Optioned | Seattle Mariners optioned LHP Jhonathan Díaz to ACL Mariners. |
| Sep 22 | Emerson Hancock | Optioned | Seattle Mariners optioned RHP Emerson Hancock to Tacoma Rainiers. |
| Sep 22 | Gabe Speier | Recalled | Seattle Mariners recalled LHP Gabe Speier from Tacoma Rainiers. |
| Sep 16 | Seby Zavala | Outrighted | Seattle Mariners sent C Seby Zavala outright to Tacoma Rainiers. |
| Sep 13 | Seby Zavala | Designated for Assignment | Seattle Mariners designated C Seby Zavala for assignment. |
| Sep 13 | Emerson Hancock | Recalled | Seattle Mariners recalled RHP Emerson Hancock from Tacoma Rainiers. |
| Sep 11 | Jason Vosler | Outrighted | Seattle Mariners sent 1B Jason Vosler outright to Tacoma Rainiers. |
| Sep 10 | Seby Zavala | Status Change | Seattle Mariners activated C Seby Zavala. |
| Sep 10 | Yimi García | Status Change | Seattle Mariners transferred RHP Yimi García from the 15-day injured list to the 60-day injured list. Right elbow inflammation. |
| Sep 10 | Luis Castillo | Status Change | Seattle Mariners placed RHP Luis Castillo on the 15-day injured list retroactive to September 9, 2024. Left hamstring strain. |
| Sep 10 | Seby Zavala | Selected | Seattle Mariners selected the contract of C Seby Zavala from Tacoma Rainiers. |
| Sep 9 | Austin Kitchen | Optioned | Seattle Mariners optioned LHP Austin Kitchen to Tacoma Rainiers. |
| Sep 9 | Austin Kitchen | Claimed Off Waivers | Seattle Mariners claimed LHP Austin Kitchen off waivers from Miami Marlins. |
| Sep 9 | Jason Vosler | Designated for Assignment | Seattle Mariners designated 1B Jason Vosler for assignment. |
| Sep 6 | Gregory Santos | Assigned | Seattle Mariners sent RHP Gregory Santos on a rehab assignment to Tacoma Rainiers. |
| Sep 6 | Gregory Santos | Assigned | Seattle Mariners sent RHP Gregory Santos on a rehab assignment to Tacoma Rainiers. |
| Sep 4 | Terrin Vavra | Outrighted | Seattle Mariners sent 2B Terrin Vavra outright to Tacoma Rainiers. |
| Sep 4 | Jesse Hahn | Signed | Seattle Mariners signed RHP Jesse Hahn. |
| Sep 1 | Eduard Bazardo | Recalled | Seattle Mariners recalled RHP Eduard Bazardo from Tacoma Rainiers. |
| Sep 1 | Jhonathan Díaz | Recalled | Seattle Mariners recalled LHP Jhonathan Diaz from Tacoma Rainiers. |
| Aug 31 | Gabe Speier | Optioned | Seattle Mariners optioned LHP Gabe Speier to Tacoma Rainiers. |
| Aug 31 | Luis Urías | Selected | Seattle Mariners selected the contract of 3B Luis Urías from Tacoma Rainiers. |
| Aug 31 | Terrin Vavra | Designated for Assignment | Seattle Mariners designated SS Terrin Vavra for assignment. |
| Aug 28 | Dominic Canzone | Optioned | Seattle Mariners optioned RF Dominic Canzone to Tacoma Rainiers. |
| Aug 28 | J.P. Crawford | Status Change | Seattle Mariners activated SS J.P. Crawford from the 10-day injured list. |
| Aug 26 | Duke Ellis | Claimed Off Waivers | New York Yankees claimed OF Duke Ellis off waivers from Seattle Mariners. |
| Aug 24 | J.P. Crawford | Assigned | Seattle Mariners sent SS J.P. Crawford on a rehab assignment to Tacoma Rainiers. |
| Aug 23 | Yimi García | Status Change | Seattle Mariners placed RHP Yimi García on the 15-day injured list retroactive to August 20, 2024. Right elbow inflammation. |
| Aug 23 | Gabe Speier | Recalled | Seattle Mariners recalled LHP Gabe Speier from Tacoma Rainiers. |
| Aug 23 | Terrin Vavra | Optioned | Seattle Mariners optioned SS Terrin Vavra to Tacoma Rainiers. |
| Aug 23 | Terrin Vavra | Claimed Off Waivers | Seattle Mariners claimed SS Terrin Vavra off waivers from Baltimore Orioles. |
| Aug 23 | Duke Ellis | Designated for Assignment | Seattle Mariners designated OF Duke Ellis for assignment. |
| Aug 11 | Jonathan Hernández | Outrighted | Seattle Mariners sent RHP Jonathan Hernández outright to Tacoma Rainiers. |
| Aug 11 | Julio Rodríguez | Status Change | Seattle Mariners activated OF Julio Rodríguez from the 10-day injured list. |
| Aug 11 | Ryan Bliss | Optioned | Seattle Mariners optioned SS Ryan Bliss to Tacoma Rainiers. |
| Aug 10 | Eduard Bazardo | Optioned | Seattle Mariners optioned RHP Eduard Bazardo to Tacoma Rainiers. |
| Aug 10 | Troy Taylor | Selected | Seattle Mariners selected the contract of RHP Troy Taylor from Arkansas Travelers. |
| Aug 8 | Jonathan Hernández | Designated for Assignment | Seattle Mariners designated RHP Jonathan Hernández for assignment. |
| Aug 8 | Jason Vosler | Optioned | Seattle Mariners optioned 3B Jason Vosler to Tacoma Rainiers. |
| Aug 8 | Eduard Bazardo | Recalled | Seattle Mariners recalled RHP Eduard Bazardo from Tacoma Rainiers. |
| Aug 8 | Dominic Canzone | Status Change | Seattle Mariners activated RF Dominic Canzone from the 10-day injured list. |
| Aug 8 | Nick Payero | Signed as Free Agent | Seattle Mariners signed free agent RHP Nick Payero to a minor league contract. |
| Aug 7 | Ryan Bliss | Recalled | Seattle Mariners recalled SS Ryan Bliss from Tacoma Rainiers. |
| Aug 7 | Cade Marlowe | Optioned | Seattle Mariners optioned LF Cade Marlowe to Tacoma Rainiers. |
| Aug 6 | Josh Fleming | Signed as Free Agent | Seattle Mariners signed free agent LHP Josh Fleming to a minor league contract. |
| Aug 5 | Brett de Geus | Claimed Off Waivers | Miami Marlins claimed RHP Brett de Geus off waivers from Seattle Mariners. |
| Aug 5 | — | Claimed Off Waivers | Miami Marlins claimed off waivers from Seattle Mariners. |
| Aug 3 | Jhonathan Díaz | Optioned | Seattle Mariners optioned LHP Jhonathan Diaz to Tacoma Rainiers. |
| Aug 3 | Jonathan Hernández | Status Change | Seattle Mariners activated RHP Jonathan Hernández. |
| Aug 2 | Jonathan Hernández | Claimed Off Waivers | Seattle Mariners claimed RHP Jonathan Hernández off waivers from Texas Rangers. |
| Aug 2 | Brett de Geus | Designated for Assignment | Seattle Mariners designated RHP Brett de Geus for assignment. |
| Aug 2 | Gregory Santos | Status Change | Seattle Mariners placed RHP Gregory Santos on the 15-day injured list retroactive to August 1, 2024. Right biceps inflammation. |
| Aug 2 | JT Chargois | Status Change | Seattle Mariners activated RHP JT Chargois. |
| Aug 1 | Dominic Canzone | Assigned | Seattle Mariners sent RF Dominic Canzone on a rehab assignment to Tacoma Rainiers. |
| Aug 1 | Matthew Ellis | Signed as Free Agent | Seattle Mariners signed free agent C Matthew Ellis to a minor league contract. |
| Jul 30 | Chris Devenski | Outrighted | Seattle Mariners sent RHP Chris Devenski outright to Tacoma Rainiers. |
| Jul 30 | JT Chargois | Trade | Miami Marlins traded RHP JT Chargois to Seattle Mariners for RHP Will Schomberg. |
| Jul 30 | Justin Turner | Status Change | Seattle Mariners activated 3B Justin Turner. |
| Jul 30 | Tyler Locklear | Optioned | Seattle Mariners optioned 3B Tyler Locklear to Tacoma Rainiers. |
| Jul 30 | Gabe Speier | Optioned | Seattle Mariners optioned LHP Gabe Speier to Tacoma Rainiers. |
| Jul 30 | Jhonathan Díaz | Recalled | Seattle Mariners recalled LHP Jhonathan Diaz from Tacoma Rainiers. |
| Jul 30 | Cade Marlowe | Status Change | Seattle Mariners activated LF Cade Marlowe. |
| Jul 29 | Aiden Butler | Signed | Seattle Mariners signed RHP Aiden Butler. |
| Jul 29 | Justin Turner | Trade | Toronto Blue Jays traded 3B Justin Turner and cash to Seattle Mariners for OF RJ Schreck. |
| Jul 29 | Andruw Salcedo | Trade | Seattle Mariners traded 3B Ty France and cash to Cincinnati Reds for C Andruw Salcedo. |
| Jul 27 | Randy Arozarena | Status Change | Seattle Mariners activated CF Randy Arozarena. |
| Jul 27 | Yimi García | Status Change | Seattle Mariners activated RHP Yimi García. |
| Jul 26 | Ryan Picollo | Signed | Seattle Mariners signed OF Ryan Picollo. |
| Jul 26 | Rhylan Thomas | Trade | Seattle Mariners traded RHP Ryne Stanek to New York Mets for OF Rhylan Thomas. |
| Jul 26 | Yimi García | Trade | Toronto Blue Jays traded RHP Yimi García to Seattle Mariners for OF Jonatan Clase and C Jacob Sharp. |
| Jul 26 | Aidan Smith | Trade | Tampa Bay Rays traded CF Randy Arozarena to Seattle Mariners for RHP Brody Hopkins, OF Aidan Smith and Player To Be Named Later. |
| Jul 25 | Brody Hopkins | Status Change | RHP Brody Hopkins roster status changed by Seattle Mariners. |
| Jul 24 | Thomas Higgins | Signed as Free Agent | Seattle Mariners signed free agent RHP Thomas Higgins Jr. to a minor league contract. |
| Jul 24 | Logan Warmoth | Signed as Free Agent | Seattle Mariners signed free agent SS Logan Warmoth to a minor league contract. |
| Jul 23 | Matt Tiberia | Signed | Seattle Mariners signed RHP Matt Tiberia. |
| Jul 23 | Harrison Kreiling | Signed | Seattle Mariners signed RHP Harrison Kreiling. |
| Jul 23 | Wyatt Lunsford-Shenkman | Signed | Seattle Mariners signed RHP Wyatt Lunsford-Shenkman. |
| Jul 23 | Austin St. Laurent | Signed | Seattle Mariners signed 3B Austin St. Laurent. |
| Jul 23 | Brandon Eike | Signed | Seattle Mariners signed 3B Brandon Eike. |
| Jul 23 | Evan Truitt | Signed | Seattle Mariners signed RHP Evan Truitt. |
| Jul 23 | Grant Knipp | Signed | Seattle Mariners signed TWP Grant Knipp. |
| Jul 23 | Charlie Beilenson | Signed | Seattle Mariners signed RHP Charlie Beilenson. |
| Jul 23 | Hunter Cranton | Signed | Seattle Mariners signed RHP Hunter Cranton. |
| Jul 23 | Ryan Sloan | Signed | Seattle Mariners signed RHP Ryan Sloan. |
| Jul 23 | Jurrangelo Cijntje | Signed | Seattle Mariners signed SHP Jurrangelo Cijntje. |
| Jul 23 | J.P. Crawford | Status Change | Seattle Mariners placed SS J.P. Crawford on the 10-day injured list. Rught hand fracture. |
| Jul 23 | Julio Rodríguez | Status Change | Seattle Mariners placed OF Julio Rodríguez on the 10-day injured list. Right high ankle sprain. |
| Jul 23 | Jonatan Clase | Recalled | Seattle Mariners recalled OF Jonatan Clase from Tacoma Rainiers. |
| Jul 23 | Ty France | Designated for Assignment | Seattle Mariners designated 3B Ty France for assignment. |
| Jul 23 | Tyler Locklear | Recalled | Seattle Mariners recalled 3B Tyler Locklear from Tacoma Rainiers. |
| Jul 23 | Leo Rivas | Recalled | Seattle Mariners recalled SS Leo Rivas from Tacoma Rainiers. |
| Jul 23 | Cade Marlowe | Recalled | Seattle Mariners recalled LF Cade Marlowe from Tacoma Rainiers. |
| Jul 23 | Alisson Del Orbe | Status Change | SS Alisson Del Orbe roster status changed by Seattle Mariners. |
| Jul 23 | Alisson Del Orbe | Assigned | SS Alisson Del Orbe assigned to Seattle Mariners. |
| Jul 22 | Jonatan Clase | Optioned | Seattle Mariners optioned OF Jonatan Clase to Tacoma Rainiers. |
| Jul 22 | Jonatan Clase | Optioned | Seattle Mariners optioned OF Jonatan Clase to Tacoma Rainiers. |
| Jul 22 | Carter Dorighi | Signed as Free Agent | Seattle Mariners signed free agent SS Carter Dorighi to a minor league contract. |
| Jul 22 | Will Riley | Signed | Seattle Mariners signed RHP Will Riley. |
| Jul 22 | Brock Moore | Signed | Seattle Mariners signed RHP Brock Moore. |
| Jul 22 | Trevor Long | Signed as Free Agent | Seattle Mariners signed free agent RHP Trevor Long to a minor league contract. |
| Jul 22 | Christian Little | Signed | Seattle Mariners signed RHP Christian Little. |
| Jul 22 | Gage Boehm | Signed | Seattle Mariners signed RHP Gage Boehm. |
| Jul 22 | Mike Baumann | Trade | Seattle Mariners traded RHP Mike Baumann to San Francisco Giants. |
| Jul 22 | Ryan Bliss | Optioned | Seattle Mariners optioned SS Ryan Bliss to Tacoma Rainiers. |
| Jul 22 | Jason Vosler | Selected | Seattle Mariners selected the contract of 3B Jason Vosler from Tacoma Rainiers. |
| Jul 19 | Josh Caron | Signed | Seattle Mariners signed C Josh Caron. |
| Jul 19 | Dustin Crenshaw | Signed | Seattle Mariners signed 2B Dustin Crenshaw. |
| Jul 19 | Anthony Donofrio | Signed | Seattle Mariners signed OF Anthony Donofrio. |
| Jul 19 | Connor Dykstra | Signed | Seattle Mariners signed C Connor Dykstra. |
| Jul 19 | Mike Baumann | Designated for Assignment | Seattle Mariners designated RHP Mike Baumann for assignment. |
| Jul 19 | Gabe Speier | Status Change | Seattle Mariners activated LHP Gabe Speier from the 15-day injured list. |
| Jul 15 | Gabe Speier | Assigned | Seattle Mariners sent LHP Gabe Speier on a rehab assignment to ACL Mariners. |
| Jul 15 | Gabe Speier | Assigned | Seattle Mariners sent LHP Gabe Speier on a rehab assignment to ACL Mariners. |
| Jul 13 | Fernando Silvera | Signed as Free Agent | Seattle Mariners signed free agent LHP Fernando Silvera to a minor league contract. |
| Jul 13 | Olivier Gomez | Signed as Free Agent | Seattle Mariners signed free agent RHP Olivier Gomez to a minor league contract. |
| Jul 12 | Gabe Speier | Assigned | Seattle Mariners sent LHP Gabe Speier on a rehab assignment to Tacoma Rainiers. |
| Jul 12 | Eduard Bazardo | Optioned | Seattle Mariners optioned RHP Eduard Bazardo to Tacoma Rainiers. |
| Jul 12 | Bryan Woo | Status Change | Seattle Mariners activated RHP Bryan Woo from the 15-day injured list. |
| Jul 12 | Yunior Garcia | Signed as Free Agent | Seattle Mariners signed free agent OF Yunior Garcia to a minor league contract. |
| Jul 12 | Kobe Kato | Signed as Free Agent | Seattle Mariners signed free agent 2B Kobe Kato to a minor league contract. |
| Jul 10 | Dominic Canzone | Status Change | Seattle Mariners placed RF Dominic Canzone on the 10-day injured list. Right adductor strain. |
| Jul 10 | Jonatan Clase | Recalled | Seattle Mariners recalled OF Jonatan Clase from Tacoma Rainiers. |
| Jul 9 | Chia-Shi Shen | Signed as Free Agent | Seattle Mariners signed free agent RHP Chia-Shi Shen to a minor league contract. |
| Jul 8 | Seby Zavala | Outrighted | Seattle Mariners sent C Seby Zavala outright to Tacoma Rainiers. |
| Jul 8 | Emerson Hancock | Optioned | Seattle Mariners optioned RHP Emerson Hancock to Tacoma Rainiers. |
| Jul 8 | Gregory Santos | Status Change | Seattle Mariners activated RHP Gregory Santos from the 60-day injured list. |
| Jul 6 | Gregory Santos | Assigned | Seattle Mariners sent RHP Gregory Santos on a rehab assignment to Everett AquaSox. |
| Jul 6 | Bryan Woo | Assigned | Seattle Mariners sent RHP Bryan Woo on a rehab assignment to Everett AquaSox. |
| Jul 6 | Emerson Hancock | Recalled | Seattle Mariners recalled RHP Emerson Hancock from Tacoma Rainiers. |
| Jul 6 | Seby Zavala | Designated for Assignment | Seattle Mariners designated C Seby Zavala for assignment. |
| Jul 4 | Duke Ellis | Claimed Off Waivers | Seattle Mariners claimed OF Duke Ellis off waivers from New York Mets. |
| Jul 2 | Gregory Santos | Assigned | Seattle Mariners sent RHP Gregory Santos on a rehab assignment to Tacoma Rainiers. |
| Jul 2 | Gregory Santos | Assigned | Seattle Mariners sent RHP Gregory Santos on a rehab assignment to Tacoma Rainiers. |
| Jul 2 | Chris Devenski | Signed as Free Agent | Seattle Mariners signed free agent RHP Chris Devenski. |
| Jul 2 | Jhonathan Díaz | Optioned | Seattle Mariners optioned LHP Jhonathan Diaz to Tacoma Rainiers. |
| Jul 2 | Seby Zavala | Selected | Seattle Mariners selected the contract of C Seby Zavala from Tacoma Rainiers. |
| Jun 28 | Jhonathan Díaz | Recalled | Seattle Mariners recalled LHP Jhonathan Diaz from Tacoma Rainiers. |
| Jun 28 | Cody Bolton | Optioned | Seattle Mariners optioned RHP Cody Bolton to Tacoma Rainiers. |
| Jun 25 | Dallas Keuchel | Trade | Seattle Mariners traded LHP Dallas Keuchel to Milwaukee Brewers for cash. |
| Jun 25 | Bryan Woo | Status Change | Seattle Mariners placed RHP Bryan Woo on the 15-day injured list. Right hamstring strain. |
| Jun 25 | Collin Snider | Recalled | Seattle Mariners recalled RHP Collin Snider from Tacoma Rainiers. |
| Jun 24 | Tyler Locklear | Optioned | Seattle Mariners optioned 3B Tyler Locklear to Tacoma Rainiers. |
| Jun 24 | Jorge Polanco | Status Change | Seattle Mariners activated SS Jorge Polanco from the 10-day injured list. |
| Jun 22 | Seby Zavala | Outrighted | Seattle Mariners sent C Seby Zavala outright to Tacoma Rainiers. |
| Jun 20 | Lolo Sanchez | Signed as Free Agent | Seattle Mariners signed free agent CF Lolo Sanchez to a minor league contract. |
| Jun 18 | Jorge Polanco | Assigned | Seattle Mariners sent SS Jorge Polanco on a rehab assignment to Tacoma Rainiers. |
| Jun 18 | Jorge Polanco | Assigned | Seattle Mariners sent SS Jorge Polanco on a rehab assignment to Tacoma Rainiers. |
| Jun 18 | Seby Zavala | Designated for Assignment | Seattle Mariners designated C Seby Zavala for assignment. |
| Jun 18 | Ty France | Status Change | Seattle Mariners activated 3B Ty France from the 10-day injured list. |
| Jun 17 | Rob Kaminsky | Signed as Free Agent | Seattle Mariners signed free agent LHP Rob Kaminsky to a minor league contract. |
| Jun 16 | Matt Bowman | Assigned | RHP Matt Bowman assigned to Seattle Mariners. |
| Jun 15 | Jorge Polanco | Assigned | Seattle Mariners sent SS Jorge Polanco on a rehab assignment to Everett AquaSox. |
| Jun 15 | Jorge Polanco | Assigned | Seattle Mariners sent SS Jorge Polanco on a rehab assignment to Everett AquaSox. |
| Jun 15 | Kirby Snead | Outrighted | Seattle Mariners sent LHP Kirby Snead outright to Tacoma Rainiers. |
| Jun 14 | Matt Bowman | Outrighted | Seattle Mariners sent RHP Matt Bowman outright to Tacoma Rainiers. |
| Jun 14 | Cody Bolton | Recalled | Seattle Mariners recalled RHP Cody Bolton from Tacoma Rainiers. |
| Jun 14 | Emerson Hancock | Optioned | Seattle Mariners optioned RHP Emerson Hancock to Tacoma Rainiers. |
| Jun 13 | Eduardo Salazar | Claimed Off Waivers | Washington Nationals claimed RHP Eduardo Salazar off waivers from Seattle Mariners. |
| Jun 13 | Levi Stoudt | Claimed Off Waivers | Baltimore Orioles claimed RHP Levi Stoudt off waivers from Seattle Mariners. |
| Jun 13 | Brett de Geus | Optioned | Seattle Mariners optioned RHP Brett de Geus to Tacoma Rainiers. |
| Jun 13 | Leo Rivas | Optioned | Seattle Mariners optioned SS Leo Rivas to Tacoma Rainiers. |
| Jun 13 | Dylan Moore | Status Change | Seattle Mariners activated 1B Dylan Moore from the paternity list. |
| Jun 13 | Emerson Hancock | Recalled | Seattle Mariners recalled RHP Emerson Hancock from Tacoma Rainiers. |
| Jun 12 | Eduardo Salazar | Status Change | RHP Eduardo Salazar roster status changed by Seattle Mariners. |
| Jun 12 | Levi Stoudt | Status Change | RHP Levi Stoudt roster status changed by Seattle Mariners. |
| Jun 12 | Jhonathan Díaz | Optioned | Seattle Mariners optioned LHP Jhonathan Diaz to Tacoma Rainiers. |
| Jun 12 | Brett de Geus | Recalled | Seattle Mariners recalled RHP Brett de Geus from Tacoma Rainiers. |
| Jun 11 | Jhonathan Díaz | Recalled | Seattle Mariners recalled LHP Jhonathan Diaz from Tacoma Rainiers. |
| Jun 11 | Eduard Bazardo | Recalled | Seattle Mariners recalled RHP Eduard Bazardo from Tacoma Rainiers. |
| Jun 11 | Kirby Snead | Designated for Assignment | Seattle Mariners designated LHP Kirby Snead for assignment. |
| Jun 11 | Matt Bowman | Designated for Assignment | Seattle Mariners designated RHP Matt Bowman for assignment. |
| Jun 10 | Dylan Moore | Status Change | Seattle Mariners placed 1B Dylan Moore on the paternity list. |
| Jun 10 | Leo Rivas | Recalled | Seattle Mariners recalled SS Leo Rivas from Tacoma Rainiers. |
| Jun 9 | Matt Bowman | Selected | Seattle Mariners selected the contract of RHP Matt Bowman from Tacoma Rainiers. |
| Jun 9 | Tyler Locklear | Selected | Seattle Mariners selected the contract of 3B Tyler Locklear from Tacoma Rainiers. |
| Jun 9 | Collin Snider | Optioned | Seattle Mariners optioned RHP Collin Snider to Tacoma Rainiers. |
| Jun 9 | Levi Stoudt | Designated for Assignment | Seattle Mariners designated RHP Levi Stoudt for assignment. |
| Jun 9 | Eduardo Salazar | Designated for Assignment | Seattle Mariners designated RHP Eduardo Salazar for assignment. |
| Jun 9 | Ty France | Status Change | Seattle Mariners placed 3B Ty France on the 10-day injured list retroactive to June 8, 2024. Right heel fracture. |
| Jun 4 | Luis Urías | Outrighted | Seattle Mariners sent 3B Luis Urías outright to Tacoma Rainiers. |
| Jun 4 | Victor Robles | Signed as Free Agent | Seattle Mariners signed free agent CF Victor Robles. |
| Jun 4 | Matt Bowman | Assigned | RHP Matt Bowman assigned to Seattle Mariners. |
| Jun 3 | Jonatan Clase | Optioned | Seattle Mariners optioned OF Jonatan Clase to Tacoma Rainiers. |
| Jun 1 | Collin Snider | Recalled | Seattle Mariners recalled RHP Collin Snider from Tacoma Rainiers. |
| Jun 1 | Gabe Speier | Status Change | Seattle Mariners placed LHP Gabe Speier on the 15-day injured list retroactive to May 30, 2024. Left rotator cuff strain. |
| May 28 | Joseph Hernandez | Signed as Free Agent | Seattle Mariners signed free agent RHP Joseph Hernandez to a minor league contract. |
| May 27 | Sam Haggerty | Recalled | Seattle Mariners recalled 2B Sam Haggerty from Tacoma Rainiers. |
| May 27 | Ryan Bliss | Selected | Seattle Mariners selected the contract of SS Ryan Bliss from Tacoma Rainiers. |
| May 27 | Jorge Polanco | Status Change | Seattle Mariners placed SS Jorge Polanco on the 10-day injured list. Right hamstring strain. |
| May 26 | Sammy Peralta | Claimed Off Waivers | Chicago White Sox claimed LHP Sammy Peralta off waivers from Seattle Mariners. |
| May 26 | Eduard Bazardo | Optioned | Seattle Mariners optioned RHP Eduard Bazardo to Tacoma Rainiers. |
| May 26 | Tayler Saucedo | Status Change | Seattle Mariners activated LHP Tayler Saucedo from the 15-day injured list. |
| May 24 | Luis Urías | Optioned | Seattle Mariners optioned 3B Luis Urías to Tacoma Rainiers. |
| May 24 | Jonatan Clase | Recalled | Seattle Mariners recalled OF Jonatan Clase from Tacoma Rainiers. |
| May 23 | Dallas Keuchel | Signed as Free Agent | Seattle Mariners signed free agent LHP Dallas Keuchel to a minor league contract. |
| May 23 | Tayler Saucedo | Assigned | Seattle Mariners sent LHP Tayler Saucedo on a rehab assignment to Tacoma Rainiers. |
| May 23 | Tayler Saucedo | Assigned | Seattle Mariners sent LHP Tayler Saucedo on a rehab assignment to Tacoma Rainiers. |
| May 23 | Sammy Peralta | Designated for Assignment | Seattle Mariners designated LHP Sammy Peralta for assignment. |
| May 23 | Eduardo Salazar | Optioned | Seattle Mariners optioned RHP Eduardo Salazar to Tacoma Rainiers. |
| May 23 | Eduardo Salazar | Claimed Off Waivers | Seattle Mariners claimed RHP Eduardo Salazar off waivers from Los Angeles Dodgers. |
| May 23 | Mike Baumann | Status Change | Seattle Mariners activated RHP Mike Baumann. |
| May 23 | Cody Bolton | Optioned | Seattle Mariners optioned RHP Cody Bolton to Tacoma Rainiers. |
| May 22 | Blake Hunt | Trade | Seattle Mariners traded C Blake Hunt to Baltimore Orioles for RHP Mike Baumann and C Michael Pérez. |
| May 22 | Jhonathan Díaz | Optioned | Seattle Mariners optioned LHP Jhonathan Diaz to Tacoma Rainiers. |
| May 22 | Jhonathan Díaz | Selected | Seattle Mariners selected the contract of LHP Jhonathan Diaz from Tacoma Rainiers. |
| May 20 | J.P. Crawford | Status Change | Seattle Mariners activated SS J.P. Crawford from the 10-day injured list. |
| May 20 | J.P. Crawford | Status Change | Seattle Mariners activated SS J.P. Crawford from the 10-day injured list. |
| May 20 | Leo Rivas | Optioned | Seattle Mariners optioned SS Leo Rivas to Tacoma Rainiers. |
| May 17 | Roberto Perez | Signed as Free Agent | Seattle Mariners signed free agent RHP Roberto Perez to a minor league contract. |
| May 15 | Dominic Canzone | Status Change | Seattle Mariners activated RF Dominic Canzone from the 10-day injured list. |
| May 15 | Sam Haggerty | Optioned | Seattle Mariners optioned 2B Sam Haggerty to Tacoma Rainiers. |
| May 14 | J.P. Crawford | Assigned | Seattle Mariners sent SS J.P. Crawford on a rehab assignment to Tacoma Rainiers. |
| May 14 | — | Trade | Chicago Cubs traded SS Jake Slaughter and cash to Seattle Mariners for RHP Tyson Miller. |
| May 13 | Ruben Ramirez | Signed as Free Agent | Seattle Mariners signed free agent RHP Ruben Ramirez to a minor league contract. |
| May 11 | Dominic Canzone | Assigned | Seattle Mariners sent RF Dominic Canzone on a rehab assignment to Tacoma Rainiers. |
| May 10 | Gregori Arrieche | Signed as Free Agent | Seattle Mariners signed free agent RHP Gregori Arrieche to a minor league contract. |
| May 10 | Tyson Miller | Designated for Assignment | Seattle Mariners designated RHP Tyson Miller for assignment. |
| May 10 | Bryan Woo | Status Change | Seattle Mariners activated RHP Bryan Woo from the 15-day injured list. |
| May 8 | Tayler Saucedo | Status Change | Seattle Mariners placed LHP Tayler Saucedo on the 15-day injured list. Right knee hyperextension. |
| May 8 | Emerson Hancock | Optioned | Seattle Mariners optioned RHP Emerson Hancock to Tacoma Rainiers. |
| May 8 | Matt Brash | Status Change | Seattle Mariners transferred RHP Matt Brash from the 15-day injured list to the 60-day injured list. Right elbow inflammation. |
| May 8 | Eduard Bazardo | Status Change | Seattle Mariners activated RHP Eduard Bazardo from the 15-day injured list. |
| May 8 | Kirby Snead | Selected | Seattle Mariners selected the contract of LHP Kirby Snead from Tacoma Rainiers. |
| Apr 30 | Chandler Brierley | Signed as Free Agent | Seattle Mariners signed free agent LHP Chandler Brierley to a minor league contract. |
| Apr 29 | Jonatan Clase | Optioned | Seattle Mariners optioned OF Jonatan Clase to Tacoma Rainiers. |
| Apr 29 | Sam Haggerty | Recalled | Seattle Mariners recalled 2B Sam Haggerty from Tacoma Rainiers. |
| Apr 25 | Gregory Santos | Status Change | Seattle Mariners transferred RHP Gregory Santos from the 15-day injured list to the 60-day injured list. Right latissimus dorsi strain. |
| Apr 25 | J.P. Crawford | Status Change | Seattle Mariners placed SS J.P. Crawford on the 10-day injured list retroactive to April 24, 2024. Right oblique strain. |
| Apr 25 | Leo Rivas | Selected | Seattle Mariners selected the contract of SS Leo Rivas from Tacoma Rainiers. |
| Apr 23 | Eduard Bazardo | Assigned | Seattle Mariners sent RHP Eduard Bazardo on a rehab assignment to Tacoma Rainiers. |
| Apr 23 | Collin Snider | Optioned | Seattle Mariners optioned RHP Collin Snider to Tacoma Rainiers. |
| Apr 23 | Collin Snider | Status Change | Seattle Mariners activated RHP Collin Snider from the 15-day injured list. |
| Apr 22 | Brett de Geus | Optioned | Seattle Mariners optioned RHP Brett de Geus to Tacoma Rainiers. |
| Apr 21 | Bryan Woo | Assigned | Seattle Mariners sent RHP Bryan Woo on a rehab assignment to Tacoma Rainiers. |
| Apr 21 | Bryan Woo | Assigned | Seattle Mariners sent RHP Bryan Woo on a rehab assignment to Tacoma Rainiers. |
| Apr 21 | Cody Bolton | Status Change | Seattle Mariners activated RHP Cody Bolton from the 15-day injured list. |
| Apr 18 | Luke Barker | Signed as Free Agent | Seattle Mariners signed free agent RHP Luke Barker to a minor league contract. |
| Apr 17 | Collin Snider | Assigned | Seattle Mariners sent RHP Collin Snider on a rehab assignment to Tacoma Rainiers. |
| Apr 17 | Collin Snider | Assigned | Seattle Mariners sent RHP Collin Snider on a rehab assignment to Tacoma Rainiers. |
| Apr 17 | Cody Bolton | Assigned | Seattle Mariners sent RHP Cody Bolton on a rehab assignment to Tacoma Rainiers. |
| Apr 17 | Sam Haggerty | Optioned | Seattle Mariners optioned 2B Sam Haggerty to Tacoma Rainiers. |
| Apr 17 | Sam Haggerty | Status Change | Seattle Mariners activated 2B Sam Haggerty from the 10-day injured list. |
| Apr 15 | Ty Adcock | Claimed Off Waivers | Detroit Tigers claimed RHP Ty Adcock off waivers from Seattle Mariners. |
| Apr 15 | Dominic Canzone | Status Change | Seattle Mariners placed RF Dominic Canzone on the 10-day injured list. Left AC joint sprain. |
| Apr 15 | Jonatan Clase | Recalled | Seattle Mariners recalled OF Jonatan Clase from Tacoma Rainiers. |
| Apr 9 | Beau Taylor | Signed as Free Agent | Seattle Mariners signed free agent C Beau Taylor to a minor league contract. |
| Apr 8 | Tyson Miller | Selected | Seattle Mariners selected the contract of RHP Tyson Miller from Tacoma Rainiers. |
| Apr 8 | Brett de Geus | Selected | Seattle Mariners selected the contract of RHP Brett de Geus from Tacoma Rainiers. |
| Apr 8 | Samad Taylor | Optioned | Seattle Mariners optioned 2B Samad Taylor to Tacoma Rainiers. |
| Apr 8 | Cody Bolton | Status Change | Seattle Mariners placed RHP Cody Bolton on the 15-day injured list retroactive to April 6, 2024. General medical issue. |
| Apr 8 | Collin Snider | Status Change | Seattle Mariners placed RHP Collin Snider on the 15-day injured list. Left knee contusion. |
| Apr 8 | Ty France | Status Change | Seattle Mariners activated 3B Ty France from the paternity list. |
| Apr 8 | Ty Adcock | Designated for Assignment | Seattle Mariners designated RHP Ty Adcock for assignment. |
| Apr 5 | Dallas Keuchel | Signed as Free Agent | Seattle Mariners signed free agent LHP Dallas Keuchel to a minor league contract. |
| Apr 5 | Sam Haggerty | Assigned | Seattle Mariners sent 2B Sam Haggerty on a rehab assignment to Tacoma Rainiers. |
| Apr 5 | Samad Taylor | Recalled | Seattle Mariners recalled 2B Samad Taylor from Tacoma Rainiers. |
| Apr 5 | Ty France | Status Change | Seattle Mariners placed 3B Ty France on the paternity list. |
| Apr 2 | Sammy Peralta | Status Change | Seattle Mariners reassigned LHP Sammy Peralta to the minor leagues. |
| Apr 2 | Bryan Pope | Signed as Free Agent | Seattle Mariners signed free agent RHP Bryan Pope to a minor league contract. |
| Apr 2 | Sammy Peralta | Claimed Off Waivers | Seattle Mariners claimed LHP Sammy Peralta off waivers from Chicago White Sox. |
| Apr 2 | Taylor Trammell | Claimed Off Waivers | Los Angeles Dodgers claimed LF Taylor Trammell off waivers from Seattle Mariners. |
| Apr 1 | Matt Tabor | Signed as Free Agent | Seattle Mariners signed free agent RHP Matt Tabor to a minor league contract. |
| Mar 28 | Michael Mariot | Signed as Free Agent | Seattle Mariners signed free agent RHP Michael Mariot to a minor league contract. |
| Mar 28 | Brian Anderson | Signed as Free Agent | Seattle Mariners signed free agent 3B Brian Anderson to a minor league contract. |
| Mar 28 | Logan Gragg | Assigned | RHP Logan Gragg assigned to Seattle Mariners. |
| Mar 28 | Nelson Cruz | Retired | DH Nelson Cruz retired. |
| Mar 28 | Emerson Hancock | Recalled | Seattle Mariners recalled RHP Emerson Hancock from Tacoma Rainiers. |
| Mar 28 | Gregory Santos | Status Change | Seattle Mariners placed RHP Gregory Santos on the 15-day injured list retroactive to March 25, 2024. Right latissimus dorsi strain. |
| Mar 28 | Bryan Woo | Status Change | Seattle Mariners placed RHP Bryan Woo on the 15-day injured list retroactive to March 25, 2024. Right medial albow inflammation. |
| Mar 28 | Eduard Bazardo | Status Change | Seattle Mariners placed RHP Eduard Bazardo on the 15-day injured list retroactive to March 25, 2024. Right rotator cuff strain. |
| Mar 28 | Matt Brash | Status Change | Seattle Mariners placed RHP Matt Brash on the 15-day injured list retroactive to March 25, 2024. Right elbow inflammation. |
| Mar 28 | Sam Haggerty | Status Change | Seattle Mariners placed 2B Sam Haggerty on the 10-day injured list retroactive to March 25, 2024. Medical procedure. |
| Mar 28 | Taylor Trammell | Designated for Assignment | Seattle Mariners designated LF Taylor Trammell for assignment. |
| Mar 27 | C.J. Widger | Signed as Free Agent | Seattle Mariners signed free agent LHP C.J. Widger to a minor league contract. |
| Mar 24 | Brian Anderson | Released | Seattle Mariners released 3B Brian Anderson. |
| Mar 24 | Carlos Jimenez | Assigned | CF Carlos Jimenez assigned to Seattle Mariners. |
| Mar 24 | Ricardo Cova | Assigned | SS Ricardo Cova assigned to Seattle Mariners. |
| Mar 24 | Felnin Celesten | Assigned | SS Felnin Celesten assigned to Seattle Mariners. |
| Mar 23 | Shaddon Peavyhouse | Assigned | RHP Shaddon Peavyhouse assigned to Seattle Mariners. |
| Mar 23 | Samad Taylor | Optioned | Seattle Mariners optioned 2B Samad Taylor to Tacoma Rainiers. |
| Mar 23 | Emerson Hancock | Optioned | Seattle Mariners optioned RHP Emerson Hancock to Tacoma Rainiers. |
| Mar 22 | Jared Oliva | Assigned | OF Jared Oliva assigned to Seattle Mariners. |
| Mar 22 | Ben Onyshko | Assigned | LHP Ben Onyshko assigned to Seattle Mariners. |
| Mar 22 | Jacob Sharp | Assigned | C Jacob Sharp assigned to Seattle Mariners. |
| Mar 21 | Grant Witherspoon | Signed as Free Agent | Seattle Mariners signed free agent OF Grant Witherspoon to a minor league contract. |
| Mar 21 | Carlos Vargas | Optioned | Seattle Mariners optioned RHP Carlos Vargas to Tacoma Rainiers. |
| Mar 20 | — | Trade | Philadelphia Phillies traded RHP Jason Ruffcorn to Seattle Mariners for cash. |
| Mar 19 | Cade Marlowe | Optioned | Seattle Mariners optioned LF Cade Marlowe to Tacoma Rainiers. |
| Mar 19 | Kyle Hill | Assigned | RHP Kyle Hill assigned to Seattle Mariners. |
| Mar 18 | Jonatan Clase | Optioned | Seattle Mariners optioned OF Jonatan Clase to Tacoma Rainiers. |
| Mar 17 | Junior Gonzalez | Assigned | C Junior Gonzalez assigned to Seattle Mariners. |
| Mar 17 | Blake Townsend | Assigned | LHP Blake Townsend assigned to Seattle Mariners. |
| Mar 17 | Chris Jefferson | Assigned | RHP Chris Jefferson assigned to Seattle Mariners. |
| Mar 17 | Jesse Wainscott | Assigned | RHP Jesse Wainscott assigned to Seattle Mariners. |
| Mar 17 | Mauricio Llovera | Assigned | RHP Mauricio Llovera assigned to Seattle Mariners. |
| Mar 16 | Jose Caguana | Assigned | C Jose Caguana assigned to Seattle Mariners. |
| Mar 16 | Victor Labrada | Assigned | CF Victor Labrada assigned to Seattle Mariners. |
| Mar 15 | Natanael Garabitos | Trade | Seattle Mariners traded RHP Natanael Garabitos to Kansas City Royals. |
| Mar 15 | Colin Davis | Assigned | OF Colin Davis assigned to Seattle Mariners. |
| Mar 15 | Robbie Tenerowicz | Status Change | 2B Robbie Tenerowicz roster status changed by Seattle Mariners. |
| Mar 15 | Robbie Tenerowicz | Assigned | 2B Robbie Tenerowicz assigned to Seattle Mariners. |
| Mar 15 | James Parker | Assigned | SS James Parker assigned to Seattle Mariners. |
| Mar 14 | Mauricio Llovera | Outrighted | Seattle Mariners sent RHP Mauricio Llovera outright to Tacoma Rainiers. |
| Mar 14 | RJ Schreck | Assigned | OF RJ Schreck assigned to Seattle Mariners. |
| Mar 14 | Jose Geraldo | Assigned | RHP Jose Geraldo assigned to Seattle Mariners. |
| Mar 13 | Carson Jones | Assigned | OF Carson Jones assigned to Seattle Mariners. |
| Mar 12 | Hansel Robles | Signed as Free Agent | Seattle Mariners signed free agent RHP Hansel Robles to a minor league contract. |
| Mar 11 | Levi Stoudt | Optioned | Seattle Mariners optioned RHP Levi Stoudt to Tacoma Rainiers. |
| Mar 11 | Charlie Pagliarini | Assigned | 3B Charlie Pagliarini assigned to Seattle Mariners. |
| Mar 11 | Allan Saathoff | Assigned | RHP Allan Saathoff assigned to Seattle Mariners. |
| Mar 11 | Jimmy Kingsbury | Assigned | RHP Jimmy Kingsbury assigned to Seattle Mariners. |
| Mar 10 | Ty Adcock | Optioned | Seattle Mariners optioned RHP Ty Adcock to Tacoma Rainiers. |
| Mar 10 | Gabriel Moncada | Assigned | 1B Gabe Moncada assigned to Seattle Mariners. |
| Mar 10 | Ryne Stanek | Status Change | Seattle Mariners activated RHP Ryne Stanek. |
| Mar 10 | Ryne Stanek | Signed as Free Agent | Seattle Mariners signed free agent RHP Ryne Stanek. |
| Mar 10 | Jackson Kowar | Status Change | Seattle Mariners placed RHP Jackson Kowar on the 60-day injured list. Right ulnar collateral ligament tear. |
| Mar 9 | Jason Vosler | Signed as Free Agent | Seattle Mariners signed free agent 3B Jason Vosler to a minor league contract. |
| Mar 9 | Blake Hunt | Optioned | Seattle Mariners optioned C Blake Hunt to Tacoma Rainiers. |
| Mar 9 | Jordan Holloway | Assigned | RHP Jordan Holloway assigned to Seattle Mariners. |
| Mar 8 | Ty Duvall | Assigned | C Ty Duvall assigned to Seattle Mariners. |
| Mar 6 | Reid Morgan | Assigned | RHP Reid Morgan assigned to Seattle Mariners. |
| Mar 6 | Tai Peete | Assigned | SS Tai Peete assigned to Seattle Mariners. |
| Mar 6 | Caleb Cali | Assigned | 3B Caleb Cali assigned to Seattle Mariners. |
| Mar 6 | Brett de Geus | Status Change | RHP Brett de Geus roster status changed by Seattle Mariners. |
| Mar 5 | Ben Ramirez | Status Change | SS Ben Ramirez roster status changed by Seattle Mariners. |
| Mar 5 | Freuddy Batista | Assigned | C Freuddy Batista assigned to Seattle Mariners. |
| Mar 5 | George Feliz | Assigned | OF George Feliz assigned to Seattle Mariners. |
| Mar 5 | Ben Ramirez | Assigned | SS Ben Ramirez assigned to Seattle Mariners. |
| Mar 5 | Morgan McCullough | Assigned | SS Morgan McCullough assigned to Seattle Mariners. |
| Mar 5 | Ben Williamson | Assigned | 3B Ben Williamson assigned to Seattle Mariners. |
| Mar 5 | Charlie Welch | Assigned | C Charlie Welch assigned to Seattle Mariners. |
| Mar 3 | Connor Charping | Status Change | C Connor Charping roster status changed by Seattle Mariners. |
| Mar 3 | Michael Arroyo | Assigned | SS Michael Arroyo assigned to Seattle Mariners. |
| Mar 3 | Connor Charping | Assigned | C Connor Charping assigned to Seattle Mariners. |
| Mar 3 | Lazaro Montes | Assigned | OF Lazaro Montes assigned to Seattle Mariners. |
| Mar 3 | Luis Suisbel | Status Change | 3B Luis Suisbel roster status changed by Seattle Mariners. |
| Mar 3 | Luis Suisbel | Assigned | 3B Luis Suisbel assigned to Seattle Mariners. |
| Mar 1 | Luis Curvelo | Status Change | RHP Luis Curvelo roster status changed by Seattle Mariners. |
| Mar 1 | Aidan Smith | Assigned | OF Aidan Smith assigned to Seattle Mariners. |
| Mar 1 | Axel Sanchez | Assigned | SS Axel Sanchez assigned to Seattle Mariners. |
| Mar 1 | Josh Hood | Assigned | SS Josh Hood assigned to Seattle Mariners. |
| Mar 1 | Luis Curvelo | Assigned | RHP Luis Curvelo assigned to Seattle Mariners. |
| Mar 1 | Brandyn Garcia | Assigned | LHP Brandyn Garcia assigned to Seattle Mariners. |
| Mar 1 | Ty Cummings | Assigned | RHP Ty Cummings assigned to Seattle Mariners. |
| Feb 29 | Jonny Farmelo | Assigned | OF Jonny Farmelo assigned to Seattle Mariners. |
| Feb 29 | Bill Knight | Assigned | OF Bill Knight assigned to Seattle Mariners. |
| Feb 29 | Logan Evans | Assigned | RHP Logan Evans assigned to Seattle Mariners. |
| Feb 29 | Raúl Alcantara | Assigned | LHP Raúl Alcantara assigned to Seattle Mariners. |
| Feb 28 | Colt Emerson | Assigned | SS Colt Emerson assigned to Seattle Mariners. |
| Feb 27 | Troy Taylor | Assigned | RHP Troy Taylor assigned to Seattle Mariners. |
| Feb 26 | Elijah Dale | Assigned | RHP Elijah Dale assigned to Seattle Mariners. |
| Feb 25 | Nick Davila | Assigned | RHP Nick Davila assigned to Seattle Mariners. |
| Feb 25 | Blas Castaño | Assigned | RHP Blas Castano assigned to Seattle Mariners. |
| Feb 24 | Trevor Kelley | Signed as Free Agent | Seattle Mariners signed free agent RHP Trevor Kelley to a minor league contract. |
| Feb 24 | Jarod Bayless | Status Change | RHP Jarod Bayless roster status changed by Seattle Mariners. |
| Feb 24 | Stefan Raeth | Status Change | RHP Stefan Raeth roster status changed by Seattle Mariners. |
| Feb 24 | Brian Anderson | Signed as Free Agent | Seattle Mariners signed free agent 3B Brian Anderson to a minor league contract. |
| Feb 24 | Peyton Alford | Status Change | LHP Peyton Alford roster status changed by Seattle Mariners. |
| Feb 24 | Juan Mercedes | Assigned | RHP Juan Mercedes assigned to Seattle Mariners. |
| Feb 24 | Jarod Bayless | Assigned | RHP Jarod Bayless assigned to Seattle Mariners. |
| Feb 24 | Brett de Geus | Assigned | RHP Brett de Geus assigned to Seattle Mariners. |
| Feb 24 | Peyton Alford | Assigned | LHP Peyton Alford assigned to Seattle Mariners. |
| Feb 24 | Juan Burgos | Assigned | RHP Juan Burgos assigned to Seattle Mariners. |
| Feb 24 | Stefan Raeth | Assigned | RHP Stefan Raeth assigned to Seattle Mariners. |
| Feb 23 | Danny Wirchansky | Signed as Free Agent | Seattle Mariners signed free agent LHP Danny Wirchansky to a minor league contract. |
| Feb 19 | Canaan Smith-Njigba | Claimed Off Waivers | Pittsburgh Pirates claimed CF Canaan Smith-Njigba off waivers from Seattle Mariners. |
| Feb 18 | Robbie Tenerowicz | Signed as Free Agent | Seattle Mariners signed free agent 2B Robbie Tenerowicz to a minor league contract. |
| Feb 17 | Levi Stoudt | Claimed Off Waivers | Seattle Mariners claimed RHP Levi Stoudt off waivers from Cincinnati Reds. |
| Feb 12 | Darren McCaughan | Trade | Seattle Mariners traded RHP Darren McCaughan to Miami Marlins. |
| Feb 9 | Jordan Holloway | Signed as Free Agent | Seattle Mariners signed free agent RHP Jordan Holloway to a minor league contract. |
| Feb 7 | Joey Krehbiel | Status Change | RHP Joey Krehbiel roster status changed by Seattle Mariners. |
| Feb 7 | Cole Young | Assigned | Seattle Mariners invited non-roster SS Cole Young to spring training. |
| Feb 7 | Hogan Windish | Assigned | Seattle Mariners invited non-roster 1B Hogan Windish to spring training. |
| Feb 7 | Nick Solak | Assigned | Seattle Mariners invited non-roster 2B Nick Solak to spring training. |
| Feb 7 | Brock Rodden | Assigned | Seattle Mariners invited non-roster SS Brock Rodden to spring training. |
| Feb 7 | Leo Rivas | Assigned | Seattle Mariners invited non-roster SS Leo Rivas to spring training. |
| Feb 7 | Rangel Ravelo | Assigned | Seattle Mariners invited non-roster 1B Rangel Ravelo to spring training. |
| Feb 7 | Kaden Polcovich | Status Change | 2B Kaden Polcovich roster status changed by Seattle Mariners. |
| Feb 7 | Kaden Polcovich | Assigned | Seattle Mariners invited non-roster 2B Kaden Polcovich to spring training. |
| Feb 7 | Tyler Locklear | Assigned | Seattle Mariners invited non-roster 3B Tyler Locklear to spring training. |
| Feb 7 | Michael Chavis | Assigned | Seattle Mariners invited non-roster 2B Michael Chavis to spring training. |
| Feb 7 | Ryan Bliss | Assigned | Seattle Mariners invited non-roster SS Ryan Bliss to spring training. |
| Feb 7 | Alberto Rodriguez | Assigned | Seattle Mariners invited non-roster OF Alberto Rodriguez to spring training. |
| Feb 7 | Spencer Packard | Assigned | Seattle Mariners invited non-roster OF Spencer Packard to spring training. |
| Feb 7 | Isiah Gilliam | Assigned | Seattle Mariners invited non-roster RF Isiah Gilliam to spring training. |
| Feb 7 | Matt Scheffler | Assigned | Seattle Mariners invited non-roster C Matt Scheffler to spring training. |
| Feb 7 | Michael Papierski | Assigned | Seattle Mariners invited non-roster C Michael Papierski to spring training. |
| Feb 7 | Harry Ford | Assigned | Seattle Mariners invited non-roster C Harry Ford to spring training. |
| Feb 7 | Jake Anchia | Assigned | Seattle Mariners invited non-roster C Jake Anchia to spring training. |
| Feb 7 | Reid VanScoter | Assigned | Seattle Mariners invited non-roster LHP Reid VanScoter to spring training. |
| Feb 7 | Kirby Snead | Signed as Free Agent | Seattle Mariners signed free agent LHP Kirby Snead to a minor league contract and invited him to spring training. |
| Feb 7 | Sean Poppen | Assigned | Seattle Mariners invited non-roster RHP Sean Poppen to spring training. |
| Feb 7 | Marcelo Perez | Assigned | Seattle Mariners invited non-roster RHP Marcelo Perez to spring training. |
| Feb 7 | Tyson Miller | Assigned | Seattle Mariners invited non-roster RHP Tyson Miller to spring training. |
| Feb 7 | Darren McCaughan | Assigned | Seattle Mariners invited non-roster RHP Darren McCaughan to spring training. |
| Feb 7 | Darren McCaughan | Outrighted | Seattle Mariners sent RHP Darren McCaughan outright to Tacoma Rainiers. |
| Feb 7 | Holden Laws | Assigned | Seattle Mariners invited non-roster LHP Holden Laws to spring training. |
| Feb 7 | Casey Lawrence | Signed as Free Agent | Seattle Mariners signed free agent RHP Casey Lawrence to a minor league contract and invited him to spring training. |
| Feb 7 | Travis Kuhn | Assigned | Seattle Mariners invited non-roster RHP Travis Kuhn to spring training. |
| Feb 7 | Joey Krehbiel | Signed as Free Agent | Seattle Mariners signed free agent RHP Joey Krehbiel to a minor league contract and invited him to spring training. |
| Feb 7 | Jimmy Joyce | Assigned | Seattle Mariners invited non-roster RHP Jimmy Joyce to spring training. |
| Feb 7 | Jhonathan Díaz | Signed as Free Agent | Seattle Mariners signed free agent LHP Jhonathan Diaz to a minor league contract and invited him to spring training. |
| Feb 7 | Ty Buttrey | Assigned | Seattle Mariners invited non-roster RHP Ty Buttrey to spring training. |
| Feb 7 | Cory Abbott | Signed as Free Agent | Seattle Mariners signed free agent RHP Cory Abbott to a minor league contract and invited him to spring training. |
| Feb 7 | Canaan Smith-Njigba | Claimed Off Waivers | Seattle Mariners claimed CF Canaan Smith-Njigba off waivers from Pittsburgh Pirates. |
| Feb 7 | Darren McCaughan | Designated for Assignment | Seattle Mariners designated RHP Darren McCaughan for assignment. |
| Feb 6 | Cole Tucker | Status Change | SS Cole Tucker roster status changed by Seattle Mariners. |
| Feb 6 | Cole Tucker | Assigned | Seattle Mariners invited non-roster SS Cole Tucker to spring training. |
| Feb 6 | Cole Tucker | Signed as Free Agent | Seattle Mariners signed free agent SS Cole Tucker to a minor league contract. |
| Feb 6 | Nick Solak | Signed as Free Agent | Seattle Mariners signed free agent 2B Nick Solak to a minor league contract. |
| Feb 6 | Collin Snider | Claimed Off Waivers | Seattle Mariners claimed RHP Collin Snider off waivers from Arizona Diamondbacks. |
| Feb 3 | Gregory Santos | Status Change | Seattle Mariners activated RHP Gregory Santos. |
| Feb 3 | — | Trade | Chicago White Sox traded RHP Gregory Santos to Seattle Mariners for RHP Prelander Berroa, OF Zach DeLoach and Future Considerations. |
| Feb 2 | Juan Cazarez | Signed as Free Agent | Seattle Mariners signed free agent RHP Juan Cazarez to a minor league contract. |
| Feb 2 | Heath Hembree | Signed as Free Agent | Seattle Mariners signed free agent RHP Heath Hembree to a minor league contract. |
| Jan 31 | Mathias Sato | Signed as Free Agent | Seattle Mariners signed free agent RHP Mathias Sato to a minor league contract. |
| Jan 31 | Deybi Castro | Signed as Free Agent | Seattle Mariners signed free agent RHP Deybi Castro to a minor league contract. |
| Jan 31 | Danery Meyer | Signed as Free Agent | Seattle Mariners signed free agent RHP Danery Meyer to a minor league contract. |
| Jan 30 | Juan Jimenez | Signed as Free Agent | Seattle Mariners signed free agent RHP Juan Jimenez to a minor league contract. |
| Jan 30 | — | Trade | Kansas City Royals traded 2B Samad Taylor to Seattle Mariners for Player To Be Named Later. |
| Jan 29 | Justin Topa | Trade | Minnesota Twins traded SS Jorge Polanco to Seattle Mariners for RHP Anthony DeSclafani, RHP Justin Topa, OF Gabriel Gonzalez, RHP Darren Bowen and cash. |
| Jan 23 | Jack White | Signed as Free Agent | Seattle Mariners signed free agent LHP Jack White to a minor league contract. |
| Jan 23 | Morgan McCullough | Signed as Free Agent | Seattle Mariners signed free agent SS Morgan McCullough to a minor league contract. |
| Jan 23 | Garrett Davila | Signed as Free Agent | Seattle Mariners signed free agent LHP Garrett Davila to a minor league contract. |
| Jan 22 | Michael Papierski | Signed as Free Agent | Seattle Mariners signed free agent C Michael Papierski to a minor league contract. |
| Jan 20 | Lisander Brito | Released | Seattle Mariners released RHP Lisander Brito. |
| Jan 20 | Joshua Francis | Released | Seattle Mariners released 2B Joshua Francis. |
| Jan 20 | Gregori Arrieche | Signed as Free Agent | Seattle Mariners signed free agent RHP Gregori Arrieche to a minor league contract. |
| Jan 19 | Eduardo Ponce | Signed as Free Agent | Seattle Mariners signed free agent C Eduardo Ponce to a minor league contract. |
| Jan 19 | Eduardo Uscanga | Signed as Free Agent | Seattle Mariners signed free agent RHP Eduardo Uscanga to a minor league contract. |
| Jan 18 | Sean Poppen | Signed as Free Agent | Seattle Mariners signed free agent RHP Sean Poppen to a minor league contract. |
| Jan 18 | Ty Buttrey | Signed as Free Agent | Seattle Mariners signed free agent RHP Ty Buttrey to a minor league contract. |
| Jan 18 | Michael Chavis | Signed as Free Agent | Seattle Mariners signed free agent 2B Michael Chavis to a minor league contract. |
| Jan 17 | Austin Voth | Status Change | Seattle Mariners activated RHP Austin Voth. |
| Jan 17 | Austin Voth | Signed as Free Agent | Seattle Mariners signed free agent RHP Austin Voth. |
| Jan 15 | Erick Lanza | Signed as Free Agent | Seattle Mariners signed free agent RHP Erick Lanza to a minor league contract. |
| Jan 15 | Joshua Francis | Signed as Free Agent | Seattle Mariners signed free agent 2B Joshua Francis to a minor league contract. |
| Jan 15 | Cristian Aray | Signed as Free Agent | Seattle Mariners signed free agent RHP Cristian Aray to a minor league contract. |
| Jan 15 | Manuel De Cesare | Signed as Free Agent | Seattle Mariners signed free agent OF Manuel De Cesare to a minor league contract. |
| Jan 15 | Gabriel Guanchez | Signed as Free Agent | Seattle Mariners signed free agent C Gabriel Guanchez to a minor league contract. |
| Jan 15 | Carlos Jaspe | Signed as Free Agent | Seattle Mariners signed free agent RHP Carlos Jaspe to a minor league contract. |
| Jan 15 | Jheifer Ramirez | Signed as Free Agent | Seattle Mariners signed free agent RHP Jheifer Ramirez to a minor league contract. |
| Jan 15 | Manuel Baez | Signed as Free Agent | Seattle Mariners signed free agent C Manuel Baez to a minor league contract. |
| Jan 15 | Deuri Castillo | Signed as Free Agent | Seattle Mariners signed free agent SS Deuri Castillo to a minor league contract. |
| Jan 15 | Anderson Jimenez | Signed as Free Agent | Seattle Mariners signed free agent RHP Anderson Jimenez to a minor league contract. |
| Jan 15 | Zeus Nunez | Signed as Free Agent | Seattle Mariners signed free agent 3B Zeus Nunez to a minor league contract. |
| Jan 15 | David Pena | Signed as Free Agent | Seattle Mariners signed free agent RHP David Pena to a minor league contract. |
| Jan 15 | Eliezer Orbe | Signed as Free Agent | Seattle Mariners signed free agent LHP Eliezer Orbe to a minor league contract. |
| Jan 15 | Dawel Joseph | Signed as Free Agent | Seattle Mariners signed free agent SS Dawel Joseph to a minor league contract. |
| Jan 15 | Leandro Romero | Signed as Free Agent | Seattle Mariners signed free agent SS Leandro Romero to a minor league contract. |
| Jan 15 | Cade Marlowe | Status Change | Seattle Mariners activated LF Cade Marlowe. |
| Jan 10 | Mauricio Llovera | Status Change | Seattle Mariners activated RHP Mauricio Llovera. |
| Jan 10 | Mauricio Llovera | Claimed Off Waivers | Seattle Mariners claimed RHP Mauricio Llovera off waivers from Boston Red Sox. |
| Jan 5 | José Caballero | Trade | Tampa Bay Rays traded LF Luke Raley to Seattle Mariners for SS José Caballero. |
| Jan 5 | — | Trade | Seattle Mariners traded LHP Robbie Ray to San Francisco Giants for RF Mitch Haniger, RHP Anthony DeSclafani and cash. |